/* ─── Global ─────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    overflow-x: hidden;
    width: 100%;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 64px;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f4f8ff;
    color: #1a1a2e;
    margin: 0;
    padding: 0;
}

/* ─── Navbar ─────────────────────────────────────────────── */
.top-nav {
    background-color: #1565C0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(21, 101, 192, 0.35);
}

.top-nav .brand-logo {
    font-weight: 900;
    font-size: 22px;
    letter-spacing: 2px;
    color: #ffffff;
}

.top-nav ul a {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    transition: color 0.2s;
}

.top-nav ul a:hover {
    color: #ffffff;
    background: transparent;
}

.sidenav a {
    color: #1565C0;
    font-weight: 500;
}

/* ─── Hero ───────────────────────────────────────────────── */
.hero-section {
    background: linear-gradient(145deg, #1565C0 0%, #1976D2 30%, #64B5F6 65%, #BBDEFB 100%);
    padding: 89px 0 90px;
    position: relative;
    overflow: hidden;
    width: 100%;
}

.hero-row {
    min-height: 380px;
    width: 100%;
}

.hero-text-col {
    padding-left: 6% !important;
    padding-right: 16px;
}

.hero-photo-col {
    padding-right: 3% !important;
}

.hero-tag {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 20px;
    padding: 4px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 700;
    color: #ffffff;
    line-height: 1.15;
    margin: 0 0 6px;
}

.hero-name {
    font-size: 3.6rem;
    font-weight: 900;
    color: #E3F2FD;
    display: block;
}

.hero-description {
    font-size: 1.05rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.88);
    max-width: 500px;
    margin: 20px 0 32px;
}

.hero-btn {
    border-radius: 6px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: #ffffff !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

/* Photo with decorative ring */
.hero-photo-col {
    position: relative;
    overflow: visible;
}

.photo-ring {
    display: inline-block;
    position: relative;
}

.photo-ring::before {
    content: '';
    position: absolute;
    inset: -12px;
    border-radius: 50%;
    border: 3px solid #42A5F5;
    opacity: 0.5;
}

.photo-ring::after {
    content: '';
    position: absolute;
    inset: -24px;
    border-radius: 50%;
    border: 1px solid #90CAF9;
    opacity: 0.35;
}

.profile-photo {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border: 4px solid #ffffff;
    box-shadow: 0 12px 40px rgba(21, 101, 192, 0.3);
    display: block;
    margin: 0 auto;
}

/* ─── Floating chips (hero) ──────────────────────────────── */
.floating-chip {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(6px);
    border-radius: 20px;
    padding: 7px 14px 7px 8px;
    font-size: 0.78rem;
    font-weight: 600;
    color: #1565C0;
    box-shadow: 0 4px 16px rgba(21, 101, 192, 0.18);
    white-space: nowrap;
    animation: floatChip 3.5s ease-in-out infinite;
}

.floating-chip img {
    width: 18px;
    height: 18px;
    object-fit: contain;
}

.fc-1 { top: -18px;  left: -60px;  animation-delay: 0s;    }
.fc-2 { top: -18px;  right: -60px; animation-delay: 0.8s;  }
.fc-3 { bottom: -18px; left: -55px;  animation-delay: 1.6s;  }
.fc-4 { bottom: -18px; right: -55px; animation-delay: 2.4s;  }

@keyframes floatChip {
    0%,  100% { transform: translateY(0);   }
    50%        { transform: translateY(-7px); }
}

/* ─── Skills ─────────────────────────────────────────────── */
.technologies-section {
    padding: 80px 0 60px;
    background-color: #ffffff;
}

.skills-header {
    margin-bottom: 48px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: #0D47A1;
    margin: 0 0 6px;
}

.section-subtitle {
    font-size: 1rem;
    color: #78909c;
    margin: 0;
}

/* Horizontal category rows */
.skill-group {
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 20px 0;
    border-bottom: 1px solid #E3F2FD;
}

.skill-group.no-border {
    border-bottom: none;
}

.skill-label {
    flex: 0 0 110px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #90CAF9;
    text-align: right;
    padding-right: 20px;
    border-right: 2px solid #BBDEFB;
    white-space: nowrap;
}

.skill-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Chip: icon + label side by side */
.tech-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: #f4f8ff;
    border: 1px solid #BBDEFB;
    border-radius: 40px;
    padding: 8px 18px 8px 10px;
    cursor: default;
    transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}

.tech-chip:hover {
    transform: translateY(-2px);
    border-color: #90CAF9;
    box-shadow: 0 4px 14px rgba(21, 101, 192, 0.12);
}

.tech-chip img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    flex-shrink: 0;
}

.tech-chip span {
    font-size: 0.9rem;
    font-weight: 500;
    color: #37474f;
    white-space: nowrap;
}

/* ─── Experience ─────────────────────────────────────────── */
.experience-section {
    padding: 80px 0 60px;
    background-color: #f4f8ff;
}

.experience-header {
    margin-bottom: 48px;
}

.timeline {
    position: relative;
    padding-left: 36px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, #1565C0, #BBDEFB);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 20px;
}

.timeline-dot {
    position: absolute;
    left: -32px;
    top: 24px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: #1565C0;
    border: 3px solid #ffffff;
    box-shadow: 0 0 0 2px #1565C0;
}

.timeline-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 28px 32px;
    border-left: 4px solid #1565C0;
}

.timeline-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.exp-role {
    font-size: 1.3rem;
    font-weight: 700;
    color: #0D47A1;
    margin: 0 0 4px;
}

.exp-company {
    font-size: 0.95rem;
    color: #546e7a;
    font-weight: 500;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.exp-date {
    font-size: 0.8rem;
    font-weight: 600;
    color: #ffffff;
    background-color: #1565C0;
    border-radius: 20px;
    padding: 4px 12px;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 4px;
    height: fit-content;
}

.exp-description {
    font-size: 0.98rem;
    line-height: 1.75;
    color: #546e7a;
    margin-bottom: 20px;
}

.exp-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.exp-tag {
    font-size: 0.78rem;
    font-weight: 600;
    color: #1565C0;
    background-color: #E3F2FD;
    border: 1px solid #BBDEFB;
    border-radius: 4px;
    padding: 3px 10px;
    letter-spacing: 0.3px;
}

/* ─── Projects ───────────────────────────────────────────── */
.projects-section {
    padding: 80px 0 100px;
    background-color: #f4f8ff;
}

.projects-header {
    margin-bottom: 40px;
}

.section-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: #42A5F5;
    text-transform: uppercase;
    display: block;
    margin-bottom: 6px;
}

/* Wide horizontal project card */
.project-wide-card {
    background: #ffffff;
    border-radius: 16px;
    overflow: hidden;
}

.no-margin {
    margin: 0 !important;
}

.no-padding {
    padding: 0 !important;
}

.project-wide-img {
    width: 100%;
    height: 100%;
    min-height: 300px;
    object-fit: cover;
    display: block;
}

.project-content-col {
    padding: 48px 40px !important;
}

.project-number {
    font-size: 4rem;
    font-weight: 900;
    color: #E3F2FD;
    line-height: 1;
    display: block;
    margin-bottom: -10px;
}

.project-title-wide {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0 0 12px;
}

.project-title-wide a {
    color: #0D47A1;
    text-decoration: none;
    transition: color 0.2s;
}

.project-title-wide a:hover {
    color: #1976D2;
}

.project-divider {
    width: 40px;
    height: 3px;
    background-color: #42A5F5;
    border-radius: 2px;
    margin-bottom: 20px;
}

.project-desc {
    font-size: 1rem;
    line-height: 1.75;
    color: #546e7a;
    margin-bottom: 24px;
}

.project-icons {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 28px;
}

.project-icon {
    width: 38px;
    height: 28px;
    object-fit: contain;
}

[data-theme="dark"] .project-icon-express {
    filter: brightness(1.35);
}

.project-btn {
    border-radius: 6px;
    font-weight: 600;
}

/* ─── Portfolio preview (project 02) ────────────────────── */
.project-portfolio-preview {
    width: 100%;
    height: 100%;
    min-height: 300px;
    background: linear-gradient(145deg, #1565C0 0%, #1976D2 30%, #64B5F6 65%, #BBDEFB 100%);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.preview-navbar {
    background-color: rgba(21, 101, 192, 0.9);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
}

.preview-logo {
    color: #fff;
    font-weight: 900;
    font-size: 13px;
    letter-spacing: 1px;
}

.preview-nav-links {
    display: flex;
    gap: 8px;
}

.preview-nav-links span {
    display: block;
    width: 30px;
    height: 5px;
    background: rgba(255,255,255,0.5);
    border-radius: 3px;
}

.preview-hero {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 20px;
    gap: 16px;
}

.preview-text-lines {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.preview-line {
    display: block;
    height: 8px;
    background: rgba(255,255,255,0.6);
    border-radius: 4px;
}

.preview-line-sm  { width: 45%; }
.preview-line-lg  { width: 85%; background: rgba(255,255,255,0.9); height: 14px; }
.preview-line-md  { width: 70%; }

.preview-circle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: rgba(255,255,255,0.3);
    border: 3px solid rgba(255,255,255,0.6);
    flex-shrink: 0;
}

.project-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project-feature-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: #2B6CB0;
    background-color: #EBF8FF;
    border: 1px solid #BEE3F8;
    border-radius: 4px;
    padding: 3px 10px;
    letter-spacing: 0.3px;
}

/* ─── Footer ─────────────────────────────────────────────── */
.page-footer {
    margin-top: 0;
}

.footer-name {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.footer-role {
    font-size: 0.9rem;
    opacity: 0.8;
    margin: 0;
}

.right-align-on-desktop {
    text-align: right;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    transition: opacity 0.2s;
}

.footer-link:hover {
    opacity: 0.75;
}

/* ─── Dark mode ─────────────────────────────────────────────── */
[data-theme="dark"] body                  { background-color: #0d1117; color: #e6edf3; }
[data-theme="dark"] .technologies-section { background-color: #161b22; }
[data-theme="dark"] .projects-section      { background-color: #0d1117; }
[data-theme="dark"] .experience-section    { background-color: #0d1117; }
[data-theme="dark"] .project-wide-card     { background-color: #161b22; }
[data-theme="dark"] .timeline-card         { background-color: #161b22; }
[data-theme="dark"] .tech-chip             { background-color: #21262d; border-color: #30363d; }
[data-theme="dark"] .tech-chip span        { color: #c9d1d9; }
[data-theme="dark"] .tech-chip img[alt="Vercel"] { filter: invert(1); }
[data-theme="dark"] .tech-chip img[alt="Railway"] { filter: invert(1); }
[data-theme="dark"] .skill-group           { border-bottom-color: #21262d; }
[data-theme="dark"] .section-title         { color: #58a6ff; }
[data-theme="dark"] .section-subtitle      { color: #8b949e; }
[data-theme="dark"] .skill-label           { color: #388bfd; border-right-color: #30363d; }
[data-theme="dark"] .project-title-wide a  { color: #58a6ff; }
[data-theme="dark"] .project-desc          { color: #8b949e; }
[data-theme="dark"] .project-number        { color: #21262d; }
[data-theme="dark"] .exp-tag               { background-color: #1a2845; color: #58a6ff; border-color: #1f3a6e; }
[data-theme="dark"] .exp-role              { color: #58a6ff; }
[data-theme="dark"] .exp-company           { color: #8b949e; }
[data-theme="dark"] .exp-description       { color: #8b949e; }
[data-theme="dark"] .section-label         { color: #388bfd; }
[data-theme="dark"] .project-divider       { background-color: #388bfd; }
[data-theme="dark"] .project-feature-tag  { background-color: #1a2845; color: #58a6ff; border-color: #1f3a6e; }
[data-theme="dark"] .skills-header,
[data-theme="dark"] .projects-header,
[data-theme="dark"] .experience-header     { color: #e6edf3; }

/* ─── Floating controls (theme + lang) ───────────────────── */
.floating-controls {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 998;
}

.floating-controls button {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: #1565C0;
    color: #ffffff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(21, 101, 192, 0.4);
    transition: background-color 0.2s, transform 0.2s;
    font-size: 0.78rem;
    font-weight: 700;
    font-family: 'Roboto', sans-serif;
}

.floating-controls button:hover {
    background-color: #1976D2;
    transform: scale(1.1);
}

/* ─── Scroll reveal ──────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── Nav active link ────────────────────────────────────── */
.top-nav ul a.nav-current {
    color: #ffffff !important;
    border-bottom: 2px solid rgba(255, 255, 255, 0.8);
}

/* ─── Back to top button ─────────────────────────────────── */
#back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background-color: #1565C0;
    color: #ffffff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(21, 101, 192, 0.4);
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.2s;
    z-index: 999;
    pointer-events: none;
}

#back-to-top.btt-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

#back-to-top:hover {
    background-color: #1976D2;
}

/* ─── Responsive tablet ──────────────────────────────────── */
@media (max-width: 992px) {
    .hero-section {
        background: linear-gradient(145deg, #1565C0 0%, #1976D2 30%, #64B5F6 65%, #BBDEFB 100%);
        padding: 60px 0 70px;
    }

    .hero-text-col {
        padding-left: 5% !important;
        padding-right: 5% !important;
    }

    .hero-photo-col {
        padding-right: 5% !important;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-name {
        font-size: 2.8rem;
    }

    .hero-photo-col {
        margin-top: 40px;
    }

    .skill-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .skill-label {
        border-right: none;
        border-bottom: 2px solid #BBDEFB;
        padding-right: 0;
        padding-bottom: 6px;
        text-align: left;
        flex: none;
    }

    .project-wide-img {
        min-height: 220px;
    }

    .project-portfolio-preview {
        min-height: 220px;
    }

    .project-content-col {
        padding: 32px 24px !important;
    }

    .right-align-on-desktop {
        text-align: left;
        margin-top: 20px;
    }
}

/* ─── Responsive mobile ──────────────────────────────────── */
@media (max-width: 600px) {

    /* Hero */
    .hero-section {
        padding: 44px 0 52px;
    }

    .hero-row {
        min-height: unset;
    }

    .hero-tag {
        font-size: 0.72rem;
        padding: 3px 12px;
    }

    .hero-title {
        font-size: 1.7rem;
    }

    .hero-name {
        font-size: 2.1rem;
    }

    .hero-description {
        font-size: 0.92rem;
        margin: 14px 0 24px;
    }

    .hero-btn {
        width: 100%;
        text-align: center;
    }

    .hero-photo-col {
        margin-top: 36px;
        margin-bottom: 4px;
    }

    .floating-chip {
        display: none;
    }

    .profile-photo {
        width: 150px;
        height: 150px;
    }

    /* Skills */
    .technologies-section {
        padding: 50px 0 36px;
    }

    .skills-header {
        margin-bottom: 28px;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .skill-group {
        padding: 14px 0;
        gap: 10px;
    }

    .skill-chips {
        gap: 8px;
    }

    .tech-chip {
        padding: 6px 12px 6px 8px;
        gap: 7px;
    }

    .tech-chip img {
        width: 22px;
        height: 22px;
    }

    .tech-chip span {
        font-size: 0.82rem;
    }

    /* Experience (index) */
    .experience-section {
        padding: 50px 0 36px;
    }

    .timeline {
        padding-left: 26px;
    }

    .timeline::before {
        left: 6px;
    }

    .timeline-dot {
        left: -22px;
        width: 12px;
        height: 12px;
        top: 20px;
    }

    .timeline-card {
        padding: 18px 16px;
    }

    .exp-role {
        font-size: 1.1rem;
    }

    .exp-date {
        font-size: 0.72rem;
        padding: 3px 10px;
    }

    .exp-tags {
        gap: 6px;
    }

    .exp-tag {
        font-size: 0.72rem;
        padding: 2px 8px;
    }

    /* Projects */
    .projects-section {
        padding: 50px 0 60px;
    }

    .projects-header {
        margin-bottom: 24px;
    }

    .project-wide-img {
        min-height: 180px;
        max-height: 220px;
    }

    .project-portfolio-preview {
        min-height: 180px;
    }

    .project-content-col {
        padding: 22px 18px !important;
    }

    .project-number {
        font-size: 2.2rem;
    }

    .project-title-wide {
        font-size: 1.3rem;
    }

    .project-desc {
        font-size: 0.92rem;
    }

    .project-btn {
        width: 100%;
        text-align: center;
    }

    /* Footer */
    .footer-name {
        font-size: 1.2rem;
    }
}